The 2017 G70 2.0T shares the Theta-II turbo platform with multiple Hyundai/Kia models and inherits the catastrophic engine failure issues that plagued this generation. Metal debris from bearing wear circulates through oil system, leading to rod knock and total engine destruction—often without warning.
Theta-II Engine Bearing Failure / Rod Knock
Common · high severityTypical onset: 60,000-100,000 mi
Symptoms: Metallic knocking that worsens with RPM, Check engine light with misfire codes, Metal shavings visible in oil, Sudden catastrophic failure with no restart, Low oil pressure warning despite full oil level
Fix: This is terminal engine failure requiring complete shortblock or longblock replacement. Root cause is bearing material breakdown allowing metal debris into oil galleys. Factory reman engines run 18-24 hours labor plus engine cost. Many owners fighting for warranty coverage under extended campaigns.
Estimated cost: $8,000-12,000
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 50,000-90,000 mi
Symptoms: ATF puddles under engine bay, driver side, Burning smell from fluid hitting exhaust, Low transmission fluid level, Harsh shifting or slipping when fluid gets low
Fix: The hard lines from transmission to cooler crack at connection points or develop pinhole leaks from road salt corrosion. Replacement requires dropping subframe for access on some lines. 3-4 hours labor plus lines and fresh ATF fill.
Estimated cost: $600-1,200
Transmission Mount Collapse
Occasional · low severityTypical onset: 70,000-110,000 mi
Symptoms: Clunk on acceleration from stop, Excessive vibration at idle in gear, Shifter vibration during highway driving, Visible separation or oil weeping from mount body
Fix: The hydraulic transmission mount separates internally, allowing excessive drivetrain movement. Common on turbo cars with spirited driving. Replacement is straightforward—support trans, unbolt, swap. 1.5-2 hours labor.
Estimated cost: $350-550
High-Pressure Fuel Pump Failure
Occasional · high severityTypical onset: 40,000-80,000 mi
Symptoms: Long cranking before start, especially cold, Stumble or hesitation under boost, P0087 code - fuel rail pressure too low, Rough idle with fuel pressure fluctuation, No-start when pump completely fails
Fix: HPFP driven off intake camshaft fails from internal wear. Contaminants from failing pump can damage injectors. Pump replacement requires intake manifold removal and cam follower inspection. 4-5 hours labor, strongly recommend fuel system flush and injector cleaning simultaneously.
Estimated cost: $1,200-2,000
Turbocharger Wastegate Rattle / Actuator Failure
Occasional · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Rattle from engine bay on cold start that disappears when warm, Check engine light with overboost or underboost codes, Loss of power under acceleration, Turbo whistle changes pitch or becomes louder
Fix: Wastegate actuator arm develops play or electronic actuator motor fails. Sometimes just actuator replacement works (6-8 hours labor), but often requires complete turbo R&R if shaft is scored. If caught early, actuator recalibration may temporarily resolve.
Estimated cost: $1,500-3,500
Piston Ring Land Failure (Performance Driving)
Rare · high severitySymptoms: Blue smoke on deceleration, Excessive oil consumption - quart per 1,000 miles or worse, Loss of compression on specific cylinder, Misfires under boost, Sparkplug fouling despite new plugs
Fix: Aggressive tuning or sustained high-load operation causes piston ring land cracking on this thin-wall casting design. Once compression is lost, complete engine rebuild required with upgraded pistons. 30+ hours labor for proper rebuild including machine work.
Estimated cost: $7,000-10,000
Only buy with confirmed fresh engine under warranty extension or expect to budget $10k for inevitable Theta-II failure—otherwise solid chassis let down by catastrophic powertrain defect.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.